<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container{
        width: 300px;
        height: 300px;
        background-color: pink;
        position: relative;
        margin-left:100px;
        }
        .box{
        width: 100px;
        height: 100px;
        background-color: green;
        position:absolute;
        left: 50px;
        top: 50px;
        }

    </style>
</head>
<body>
    <div class="container">
        <div class="box"></div>

    </div>
    
</body>
</html>